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What does MEF75 stand for?

MEF75 stands for mid-expiratory flow at 75% of FVC

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The mid-expiratory flow rate (FEF25–75%) is the average forced expiratory flow rate over the middle 50 percent of the FVC. It can help in the diagnosis of an obstructive ventilatory pattern. Because it is dependent on FVC, the FEF25–75% is highly variable. In the correct clinical situation, a reduction in FEF25–75% of less than 60 percent of that predicted and an FEV1/FVC ratio in the low to normal range may confirm airway obstruction.
Positive values represent expiration, negative values represent inspiration. At the start of the test both flow and volume are equal to zero (representing the volume in the spirometer rather than the lung). The trace moves clockwise for expiration followed by inspiration. After the starting point the curve rapidly mounts to a peak (the peak expiratory flow). (Note the FEV1 value is arbitrary in this graph and just shown for illustrative purposes; these values must be calculated as part of the procedure).
Traditionally, small airways are considered a “silent zone” of the lungs [14] because they cover a vast cross-surface area and airway volume vs large airways and they can be extensively involved with little abnormalities of conventional lung function tests [14]. However, small airways are the major site of airflow limitation in COPD & asthma [15,16] and can be interested in several lung diseases [17]. The inspection of maximum expiratory flow.
Μεγ?στη τελοεκπνευστικ? ταχ?τητα ρο?ς, maximum end-expiratory flow.
Age-related declines in lung function among participants with high average BMI were more rapid for FVC (forced vital capacity), but slower for FEV1/FVC (forced expiratory volume in 1 sec/FVC) and FEF25–75 (forced expiratory flow at 25–75%) than declines among those with low or normal average BMI. Improved air quality was associated with attenuated reductions in FEV1/FVC, FEF25–75, and FEF25–75/FVC over time among low- and normal-BMI participants, but not overweight or obese participants.
the upper portion of the curve reflects the expiratory portion of the forced vital capacity (FVC) maneuver and is also referred to as the maximal expiratory flow.